. >> one day, i flew austin to dallas to orange county, california. left the airport. spent five hours with my relatives. then got back on a plane, flew to o'hare, and frankfurt, germany, sat in a lounge, then frankfurt, back to o'hare, back to austin. >> or you could try a hotel bonus. lots of hotels can be converted into free hotel nights. this can also get extreme when people like lynn shaffer hear about the hampton inn offering a bonus. >> i take my son to disney world. we hop from hotel to hotel every night. 13 days, 13 stays. >> so you switched hotels every time. >> next method, the rental carbo us in. typically you get a raise, but when one company raised the bonus to 10,000 for a one day rental, george smart went to his airport and rented almost every car off the lot. >> how many cars did you rent? >> about 12 or 15 in a morning and i would get maybe 60 to 100,000 miles for a very inexpensive investment, the equivalent of going to europe on discount twice. >> for renting cars for a morning. >> reporter: by now, we were sitting in the first class section, becaus